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Physical significance

The Planck time is the unique combination of the gravitational constantG, the special-relativistic constantc, and the quantum constantħ, to produce a constant with units of time. Because the Planck time comes from dimensional analysis, which ignores constant factors, there is no reason to believe that exactly one unit of Planck time has any special physical significance. Rather, the Planck time represents a rough time scale at which quantum gravitational effects are likely to become important.clarification needed The nature of those effects, and the exact time scale at which they would occur, would need to be derived from an actual theory of quantum gravity. However, the reciprocal of the Planck time can be interpreted as an upper bound on the frequency of a wave. This follows from the interpretation of the Planck length as a minimal length, and hence a lower bound on the wavelength. All scientific experiments and human experiences occur over time scales that are dozens of orders of magnitude longer than the Planck time,[3] making any events happening at the Planck scale hard to detect. As of November 2016[update], the smallest time interval uncertainty in direct measurements is on the order of 850 zeptoseconds (850 × 10−21 seconds)[4]